Zantedeschia aethiopica 'Crowborough' arum lily - Unusual, pure white hood-shaped flowers that are up to 10-15cm (4-6in) long are produced from late spring to mid-summer. It makes a striking architectural clump with lovely arrow-shaped, glossy dark green leaves. It looks great grown beside water as a marginal plant and can be left outside in most frost-prone areas if it is given a deep winter mulch.
The easiest lilies to grow, the Asiatic varieties bloom in early to midsummer in a very wide range of colors on tough, hardy plants. Their star-shape summer flowers are great in the garden and last a long time in the vase (so grow a few extra to cut and bring indoors). Most types grow 2-3 feet tall. How to Grow Them: Asiatic lilies grow best in a spot with full sun and moist but well-drained soil. They're hardy in Zones 3-8./